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Born in 1922, Kooyman was a shop steward and then London full-time organiser for the Furniture, Timber and Allied Trades Union (FTAT).
He was, from 1976 to 1986, the union's Assistant General Secretary; FTAT was, later, to merge with the GMB.
A Communist Party member for 40 years, Kooyman died aged 64 in 1986.
Morning Star 4th March 1986